Hillary Clinton stumbled and appeared to have difficulty walking as she was put into a van after what her campaign characterized as an overheating episode, a video of the incident showed.

The footage, posted to social media, showed a staffer holding Clinton as she stood waiting for a vehicle to arrive at the scene.

When Clinton, the Democratic presidential nominee, attempted to enter the van, she appeared to stumble. She was eventually taken from the scene to her daughter's apartment.

Nick Merrill, a campaign spokesman for Clinton, said in a statement that the former secretary of state felt "overheated" and "departed to go to her daughter's apartment." It was about 80 degrees in Manhattan.

Clinton was later "feeling much better," Merrill added. She was eventually seen waving to cameras as she exited Chelsea Clinton's apartment a few hours later.

Fox News first reported that Clinton suffered a "medical episode" and possibly fainted as she was helped into a vehicle and rushed from the scene. This report was corroborated by NBC News.

A witness told Fox that Clinton lost a shoe during the incident.

For weeks, conservative news outlets have promoted stories suggesting Clinton is secretly battling health issues. The Clinton campaign has strongly denied such claims and dismissed them as conspiracy theories.